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Effects of QSIs on virulence factors after 24 h (n = 3). (a) Pyocyanin production; (b) Elastase; (c) Rhamnolipid. Reduction in the QS-regulated virulence factors in the presence of butein (B) was observed. Butein reduced the pyocyanin production more significantly than C30, sappanol (S) and control (C). Data shown as mean ± SD of triplicate wells ** p < 0.01 vs. control.
